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I have been thinking about the multiple thru-hulls we have on our boats and the potential problems they may cause. It seems to me that an easy way to reduce the problem caused by the existing deck/cockpit drain arrangement is to provide for a drain a few inches below each scupper and eliminate the six thru-hulls that drain through the bottom of the boat. I searched the web a bit and came up with this: http://www.thmarine.com/product.cfm?PRID=75
It seems to me that these 90 degree thru-hulls will serve our needs very well. All we would have to do is pull the boat, remove the existing thru-hulls, fill each existing hole properly and then install the new style thru-hull a few inches below the deck.
The outfit that sell these things does not sell retail. But I am sure I can find a way to purchase a set of six at a very reasonable rate.
What Am I missing here? It can’t be this easy, can it?
Lee Yonkers
Morning Glory #43Post generated from Pearson424 Forum using Mail2Forum
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Look on ebay right now. There are a bunch for sale.
http://cgi.ebay.com/GEM-MARINE-STAINLESS-STEEL-THRU-HULL-3-4-90_W0QQitemZ310128668874QQihZ021QQcategoryZ26448QQtcZphotoQQcmdZViewItem
for example is a 3/4″ for all of $10.Lee Yonkers wrote:
I have been thinking about the multiple thru-hulls we have on our
boats and the potential problems they may cause. It seems to me that
an easy way to reduce the problem caused by the existing deck/cockpit
drain arrangement is to provide for a drain a few inches below each
scupper and eliminate the six thru-hulls that drain through the bottom
of the boat. I searched the web a bit and came up with this:
http://www.thmarine.com/product.cfm?PRID=75It seems to me that these 90 degree thru-hulls will serve our needs
very well. All we would have to do is pull the boat, remove the
existing thru-hulls, fill each existing hole properly and then install
the new style thru-hull a few inches below the deck.The outfit that sell these things does not sell retail. But I am sure
I can find a way to purchase a set of six at a very reasonable rate.What Am I missing here? It can’t be this easy, can it?
Lee Yonkers
Morning Glory #43
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I wonder why they didn’t do that to begin with? Is there something special about the length of the drop and ability to then pass water quickly?
-p
s/v Deep Playa | Pearson 424 #152 | http://www.DeepPlaya.com<.. snip>
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Owners no more...
Thanks Dawn and Patrick! -
Patrick,
I think the reason for the below or at waterline thru-hulls for the drains is aesthetics. If the thru-hull is well above the water line you will get a lot of dirt streaks on the hull. Bob Fine mentioned is was going to eliminate those seacocks for the deck drains in an earlier thread. He's willing to live with the streaks and/or the effort to keep the hull clean.John
On Tue, Mar 24, 2009 at 1:53 AM, Patrick Walters < ([email][/email])> wrote:
Quote:I wonder why they didn't do that to begin with? Is there something special about the length of the drop and ability to then pass water quickly?
-p
s/v Deep Playa | Pearson 424 #152 | http://www.DeepPlaya.com<.. snip>
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Hi All,
It is my plan to use 90 degree 1-1/2″ thru-hulls to do the job. I can only eliminate 4 of the thru-hulls because the cockpit drains are too low to the water to run out like that – if you were in rough seas, they'd let water in rather than drain it out. But eliminating 4 rather large holes in the bottom can't be a bad thing…
Bob
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Bob Fine
s/v Pelican
Hull #8Post generated from Pearson424 Forum using Mail2Forum
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Here's where you can get these puppies for not too much money: http://www.jamestowndistributors.com/userportal/show_product.do?pid=9127&familyName=TH+Marine+90+degree+Thru-Hull – the white plastic ones cost like $15. each. Not bad, eh? And you don't have to purchase 50 of them.
Bob
On Tue, Mar 24, 2009 at 8:35 AM, Robert Fine < ([email][/email])> wrote:
Hi All,
It is my plan to use 90 degree 1-1/2″ thru-hulls to do the job. I can only eliminate 4 of the thru-hulls because the cockpit drains are too low to the water to run out like that – if you were in rough seas, they'd let water in rather than drain it out. But eliminating 4 rather large holes in the bottom can't be a bad thing…
Bob
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Bob Fine
s/v Pelican
Hull #8—
Bob Fine
s/v Pelican
Hull #8Post generated from Pearson424 Forum using Mail2Forum
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Lee,
Pearson clearly favored Swiss cheese. I moved several thru-hulls from just below to just above the waterline a few years ago, and entirely removed and sealed half-a-dozen others. To accommodate the many various things aboard that require a thru-hull, I plumbed them to share inlets or outlets. For example, I moved the starboard side deck scupper thru-hull from just below the waterline to just above and then led the head sink drain, the electric bilge pump discharge, the shower sump and the watermaker discharge into this same thru-hull. I also made a seawater intake manifold that uses a single thru-hull to feed the deckwash pump, the watermaker, the toilet, the galley sink seawater foot pump and a bilge washdown hose. In these examples alone I’ve used 2 thru-hulls where Our Builder Who Art in Rhode Island would’ve used 10. Similarly, my cockpit drains are now just above the waterline and are shared by the aft deck scuppers. And so on.
Obviously seawater intake thru-hulls have to be located below the waterline. Most others can be above (and can be shared!), although toilet and holding tank overboard discharges are more… discrete if they’re underwater. Also, I have led the grosser outlets – i.e., galley sink and sewage – to discharge on the port side, while all my seawater intakes are on the starboard side. Total separation seems especially advisable if you’re running any kind of watermaker.
Tor
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Silver Heels, P-424 #17
http://www.SilverHeels.us
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Original Message
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Besides John’s point about the dirt stains, I think there are a couple other factors worth considering. ABYC considers any thru-hull on the side of a sailboat as requiring a seacock, so there might be an issue with future surveys. The drain outlets would also be in a vulnerable location unless protected by a rubrail.
Another possibility might be to run the drain hoses aft to the transom. The run would be longer, but it would also eliminate the below waterline thru-hulls.
Quent -
Hi Quent,
The ABYC standard states that any through hull that is or can be below water in circumstances normally encountered needs a valve. Up at the cove stripe (where the outlet would be) could be considered out of that area. I know that I've tried to put the rail in the water with little success, but I may not be trying hard enough.
Bob
On Tue, Mar 24, 2009 at 8:56 AM, quent < ([email][/email])> wrote:
Besides John's point about the dirt stains, I think there are a couple other factors worth considering. ABYC considers any thru-hull on the side of a sailboat as requiring a seacock, so there might be an issue with future surveys. The drain outlets would also be in a vulnerable location unless protected by a rubrail.
Another possibility might be to run the drain hoses aft to the transom. The run would be longer, but it would also eliminate the below waterline thru-hulls.
Quent—
Bob Fine
s/v Pelican
Hull #8Post generated from Pearson424 Forum using Mail2Forum
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Quent,
If that was the reg in 1978, then Pearson clearly did not follow the standard. For example the deck drain outboard of the head terminates in a non-valved through hull under the sink.BTW, where are you guys? I was out sailing around the Sea of Abaco a few weeks ago and I heard another boat trying to call you. Someone came back saying you were anchored in MH, but were off the boat. I tried to call you a couple of times on VHF, but no response. Not surprising the chatter on chan 16 here is worse than in Annapolis. By the time I got back to MH a few days later you were gone. I assume you beat feet south. Are you coming back this way? I'll be here for at least another week, maybe three. Genset is out again, waiting to see if I can get the part or have to order a whole new junction box. I think I've paid for 2 Sonys by now.
Also waiting to see if I'll have crew for the return trip.
John
On Wed, Mar 25, 2009 at 10:22 AM, quent < ([email][/email])> wrote:
Hi Bob-
Perhaps ABYC changed that standard in recent years. My July 2002 copy defines Maximum Heeled Waterline on a sailboat as “…the level of the sheer amidships.” H-27.4b. This required a seacock.
A local surveyor I worked with always wrote this up, but it has been a while.
Quent—
Regards,
John Stevenson
http://www.svsarah.comPost generated from Pearson424 Forum using Mail2Forum
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Hi John-
We visited MH once, but didn’t see you there. Mostly we have been on a friend’s mooring in Man-O-War. Clairebuoyant is there getting a bottom job. We are home doing taxes, will be back on 4/9, plan on sailing north in mid-May after spending a few weeks in Abacos. I doubt we will get any further down island this year.
Sorry to hear about the genset problem. Can we bring you anything from stateside? We will fly to MH via Cherokee Air on 4/9. We have a cruising permit.
Best regards,
Quent -
Thanks, Quent, for the offer to bring parts. Unfortunately the Bahamas Customs appear to be very serious about collecting 45% duty on all boat parts. You will be asked if you are carrying any parts on your return to the Bahamas when they see you are coming back to your boat. I don't think the Cruising Permit allows the importation of boat parts.
Not worth it to try to sneak them through. A friend, who joined me last month, was asked about boat parts when he went through customs in MH. Fortunately he was only bringing me cigars.
The customs duty does not appear to apply to Bahamas businesses. Anyway the previous parts I ordered through a Nassau NL dealer did not appear to have that much mark up, just additional shipping charges.
John
On Wed, Mar 25, 2009 at 11:02 AM, quent < ([email][/email])> wrote:
Hi John-
We visited MH once, but didn't see you there. Mostly we have been on a friend's mooring in Man-O-War. Clairebuoyant is there getting a bottom job. We are home doing taxes, will be back on 4/9, plan on sailing north in mid-May after spending a few weeks in Abacos. I doubt we will get any further down island this year.
Sorry to hear about the genset problem. Can we bring you anything from stateside? We will fly to MH via Cherokee Air on 4/9. We have a cruising permit.
Best regards,
Quent—
Regards,
John Stevenson
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